US3635668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copper hydrate production
Assignee: Cities Service Co
•
Filing: 1969-03-21
•
Granted: 1972-01-18
•
Expires: 1989-03-21
Abstract
Abstract Copper sulfate, sodium hydroxide and aqueous ammonia are mixed at a pH of 10 to 12.5, the reaction mixture containing 3 to 10 grams of ammonia per liter of reaction mixture. The reactants may be fed to the reaction zone as separate streams or, if desired, the copper sulfate solution and the aqueous ammonia may be initially mixed and fed together to the reaction zone for mixture with the sodium hydroxide. The reaction temperature is maintained at less than 112* F. and the retention time is controlled so as to avoid the undesired decomposition of the cupric hydroxide product to copper oxide. The product thus obtained comprises an essentially pure cupric hydroxide product suitable for use as a chemical intermediate. In addition, the product obtained at a pH of above about 11.7 has a particle size sufficiently small so as to make the product highly suitable for use as a fungicide.
Inventors
- 👤 James Barker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:10
CPC Classifications
C; C01; C01G; C01G3/00; C01G3/02; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2004/62; C01P2006/00; C01P2006/12; C01P2006/19
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
27 words
The process of claim 1 in which the pH is from about 11.7 to about 12.5, whereby said cupric hydroxide product is also useful as a fungicide.
Claim 2
Dependent Claim
25 words
The process of claim 1 in which the amount of ammonia present is from about 3 to about 5 grams per liter of reaction mixture.
Claim 3
Dependent Claim
20 words
The process of claim 1 in which said copper sulfate, sodium hydroxide and aqueous ammonia are mixed as continuous streams.
Claim 4
Dependent Claim
20 words
The process of claim 1 in which the reaction temperature is maintained at from about 85* to about 110* F.
Claim 5
Dependent Claim
24 words
The process of claim 5 in which the retention time of said reaction mixture in the reaction zone is less than about 10 minutes.
Claim 6
Dependent Claim
27 words
The process of claim 5 in which the retention time of said reaction mixture in the reaction zone is from about one-half minute to about 10 minutes.
Claim 7
Dependent Claim
19 words
The process of claim 7 in which said retention time is from about one-half minute to about 3 minutes.
Claim 8
Dependent Claim
43 words
The process oF claim 4 in which the separation of cupric hydroxide precipitate from the reaction mixture comprises withdrawing from the reaction zone a slurry comprising said precipitate in liquid reaction products and thereafter separating said cupric hydroxide from said liquid reaction products.
Claim 9
Dependent Claim
28 words
The process of claim 9 in which the slurry withdrawn from the reaction zone is passed to a slurry-thickening zone from which wet cupric hydroxide product is withdrawn.
Claim 10
Dependent Claim
17 words
The process of claim 10 in which the cupric hydroxide product is thereafter filtered, washed and dried.
Claim 11
Dependent Claim
37 words
The process of claim 1 and including the initial mixing of the copper sulfate solution and said aqueous ammonia to form a premix and mixing said premix with the solution of sodium hydroxide in said reaction zone.
Claim 12
Dependent Claim
18 words
The process of claim 12 in which said premix and said sodium hydroxide are mixed as continuous streams.
Claim 13
Dependent Claim
20 words
The process of claim 12 in which about 2 moles of sodium hydroxide are employed per mole of copper sulfate.
Claim 14
Dependent Claim
24 words
The process of claim 12 in which the pH of the reaction mixture is in the range of from about 11.7 to about 12.5.
Claim 15
Dependent Claim
20 words
The process of claim 16 in which the reaction temperature is maintained at from about 85* to about 110* F.
Claim 16
Dependent Claim
43 words
The process of claim 16 in which the separation of cupric hydroxide precipitate from the reaction mixture comprises withdrawing from the reaction zone a slurry comprising said precipitate in liquid reaction products and thereafter separating said cupric hydroxide from said liquid reaction products.
Claim 17
Dependent Claim
15 words
The process of claim 1 in which said reactants are mixed in a batch operation.
Claim 18
Dependent Claim
20 words
The process of claim 18 in which said reactants are added to a heel of water in said reaction zone.
Claim 19
Dependent Claim
52 words
The process of claim 19 in which the pH of the reaction mixture is from about 11.7 to about 12.5, and the retention time of said reaction mixture in the reaction zone is from about one-half minute to about 10 minutes, whereby said cupric hydroxide product is also useful as a fungicide.
Claim 20
Dependent Claim
24 words
The process of claim 18 in which the copper sulfate and aqueous ammonia are premixed and sodium hydroxide is thereafter added to said premix.
Claim 21
Dependent Claim
59 words
The process of claim 21 in which the pH of the reaction mixture is from about 11.7 to about 12.5, and the retention time of said reaction mixture in the reaction zone at a pH of above about 9 is from about one-half minute to about 10 minutes, whereby said cupric hydroxide product is also useful as a fungicide.
Claim 22
Dependent Claim
33 words
The process of claim 18 in which aqueous ammonia is added to a heel of water in the reaction zone and copper sulfate and sodium hydroxide are thereafter added to said aqueous ammonia.
Claim 23
Dependent Claim
31 words
The process of claim 23 in which the pH of the reaction mixture is from about 11.7 to about 12.5, whereby said cupric hydroxide product is also useful as a fungicide.
Claim 24
Dependent Claim
20 words
The process of claim 18 in which about 2 moles of sodium hydroxide are employed per mole of copper sulfate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |